Long Xiurong couldn't sleep after dinner, because she kept hearing Princess Swan's moans and the Beast King's grunts echoing inside the castle for at least an hour before it died down.
At first, she thought that the Beast King was like her Emperor Father, who wouldn't mind having more than one wife—in fact, Lady Jade told her that the Beast King would have a lot of women in his harem, and Long Xiurong would be one of them, which she didn't mind at all as it was part of her culture.
However, she came to an understanding when she had a conversation about that pearl necklace with His Majesty before.
If he could share his love, then he wouldn't embarrass Long Xiurong like that. He would've given her the pearl necklace and made another one for Princess Swan later. It was the common way her Emperor Father did to appease his harem members.